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littlej_dvine littlej_dvine
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6 years ago
A random sample of 144 observations has a mean of 20, a median of 21, and a mode of 22 . The population standard deviation is known to equal 4.8 . The 95.44 confidence interval for the population mean is
 a. 15.2 to 24.8.
  b. 19.20 to 20.80.
  c. 19.216 to 20.784.
  d. 21.2 to 22.8.
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6 years ago
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